Milling-machine blade.



C. M. HOOVER. MILLING MACHINE BLADE. APPLICATION IILIII) MAY 9. 1914Patented Jan. 19.

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QVif-Mcsoco bazfi/g w CLYDE M. HOOVER, h COLUMBIANA, OHIQ.

MILLING-MACHINE nnann.

Specification of Letters lPatent.

Patented Jan. in, rain.

A Application filed may 9, 19M. Serial No. 83?,376.

To all whom it may concern:

Be it known that I, CLYDE M. HoovnR, a citizen of the United States,residing at Colmnbiana, in the county of Columbiana and State of Ohio,have invented a new and useful Milling-Machine Blade, of which thefollowing isa specification.

My invention relates to improvements in milling machine blades, such asare used in milling cutters, in which the body of the cuttenconsists ofa disk carried by the spindle .ot the milling machine and providedaround its periphery with a plurality of cutter blades. In millingcutters of this construction the disk body of the'cutter is providedwitha series ofnotches around its periphery, said notches being adaptedto accommodate the cutter blades which are composed of high speed steel.This form of cutter blade is especially adapted to be used in a lacernill where it is often necessary to take a heavy out upon the face ofthe casting which is being milled, and as a resuit the corners of theblades soon become dull and have to be re-ground and with continued usethe life of the blade is comparatively short. The blades, such as areused at present in these cutters, extend straight acrossthe full widthof the dish and as soon as the cutting corner of the blade be comes wornthe blade must be replaced by a new one. i

lit is the object of my invention to provide a reversible blade whichmay be removed from the disk when the cutting corner becomes suficientlyworn and replaced therein with a new cuttingcorner presented to the faceof the work.

A further object is to provide a cutter blade which will be easier togrind than the type of blade such as used at present.

A still further object is to provide a blade which may be easily andquickly detached from the disk and reinserted therein.

These objects, together with other objects readily apparent to thoseskilled in the art, may be attained by the construction illustrated inthe accompanying drawings, althou h the invention may be embodied inother i orms, the construction illustrated be; ing chosen by way ofexample.

in the drawings; Figure l is a perspective view of a mill of thevertical spindle type, showing the disk provided with my cutter blades.Fig. 2 is a detached perspec- (not shown) for clamping the work, such asthe casting indicated by A in the drawing, and t e usual meansareprovided for bringing said work into contact with the cutter. Thisconstruction being of the usual form will be readily understood by oneskilled in the art and'needs no further description; I

The disk 3 is providedwiththe central aperture 5, which is shown in thedrawings, as having the internal screw threads 6 adapted to receive thelower extremity of the spindle 2 which is usually screw threaded, butthis method of attaching the cutter proper to the spindle is notessential, as any well lrnown manner or" attaching and detaching thecutter may be used.

The disk 3 is provided around its periphery with a series of notches "Z,to receive the cutter blades 8, each or said blades being substantiallyoi the form shown more clearly in Figs. 3 and l of the drawings. lliachof the blades 8 is of substantially the same length as the blades now inuse, and each blade is provided with a notch 9 in its outer edge, thenotch 9 being preferably centrally located, said notch dividing theblade into two distinct cutting surfaces. Thus a left and a rightcutting edge 10 and it) is provided upon each blade, each of saidcutting edges being ground with the usual bevel l1 and 11,respectively,and the clearance 12 and 12 being provided for each cutting edge. Theouter edge oif each blade being divided by the notch 9 left and rightcutting edges 13 and 13", respectively, are formed, and each of theseedges being proyided with the bevel 1d and M, respectively, and theclearance 15 and i5, respectively.

Located in the periphery of the 36 intermediate the cutter receivingnotches if,

tive view of the disk provided with my cut- I Ill series of notches 16,the use of which will be hereinafter described. The blades 8 areinserted in; the notches 7 of the disk, as

shown more clearly in Figs. 2 and 5 of the drawings, and a pin 17 isinserted lo'ngitudinally ineach of the notches 16 and forced into saidnotch,with any suitable instrument, thus spreading the metalin the disk3, away from the notch 16 and tending to contract the blade receivingnotches 7, thus retaining the blades 8 firmly in the periphery of thedisk 3. When thecutting corner 18 of the blade has become worn, the pin17, which retains said blade .in its notch in the disk 3, may be easilydislodged from the notch into which it has been forced, allowing theblade 8 to be removed and reversed,

' thus presenting the cutting corner 18.

In the drawings the blade is shown as used ona cutter in a mill of thevertical spindle type, but it is'to be understood that a horizontalspindle, or in fact,any kind of a milling machine for face mill work,may

be provided with this form of cutter blade.

Although thedraw ings and above specification disclose the best mode inwhich I have contemplated embodying my invention, I desire to be notlimited to the details of such disclosure, for many changes in formand,construction may be made, as circumstances require or experiencesuggests, without departing from the spirit of the invention, within thescope of the appended claims.

1. A blade for milling machines provided upon its forward edge with twooppositely disposed beveled cutting edges.

2. A blade for milling machine cutters provided with a notch dividingthe forward edge of said blade into two oppositely disposed cuttingedges.

3. In a milling machine, the combination with a spindle, of a rotarydisk, a series of cutting blades located around the periphery of saiddisk, each of said cutting blades provided upon its forward edge withtwo oppositely disposed beveled cutting edges and means for.ret'aining'said plates in said disk.

4. A blade for milling machines provided upon its forward edge with twooppositely disposed beveled cutting edges, each of said beveled cuttingedges extending less than half of the entire length of the blade, theedges of said blade, adjoining said forward edge, 'being provided withoppositely disposed beveled cutting edges, forming two oppositelydisposed cutting corners upon the blade.

5. In a milling machine, the combination with a spindle, of a rotarydisk, a series of cutting blades located around the periphery of saiddisk, each of said blades provided upon its forward edge with twooppositely disposed beveled cutting edges, each of said beveled cuttingedges extending less than half of the entire length of the blade, andmeans for retaining said blades in said disk.

In testimony that I claim the above, I have hereunto subscribed my namein the presence of two witnesses.

CLYDE M. HOOVER.

Witnesses:

S. S. WEAVER, Lorm: HOOVER.

